Respiratory mask



FIG. 1 is a perspective view of my design;

FIG. 2 is a front view of the design of FIG. 1;

FIG. 3 is a rear view of the design of FIG. 1;

FIG. 4 is a right side view of the design of FIG. 1, the left side view bring a mirror image thereof;

FIG. 5 is a top view of the design of FIG. 1; and,

FIG. 6 is a bottom view of the design of FIG. 1.

The broken line depictions represent unclaimed subject matter. 

CLAIM The ornamental design for respiratory mask, as shown and described. 